When I was a teacher, teachers would come into my classroom and admire my desk on which lay nothing whatever, whereas theirs were heaped with papers and books.
"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.